Delphi MDI Application和MDI Children的标题栏

您所有需要的-重载过程CreateWindowHandle，如下所示：

unit CHILDWIN;
interface
uses Windows, Classes, Graphics, Forms, Controls, StdCtrls;

type
  TMDIChild = class(TForm)
  private
    { Private declarations }
  public
    { Public declarations }
    procedure CreateWindowHandle(const Params: TCreateParams); override;
  end;

implementation

{$R *.dfm}
procedure TMDIChild.CreateWindowHandle(const Params: TCreateParams);
begin
  inherited CreateWindowHandle(Params);
  SetWindowLong(Handle, GWL_EXSTYLE, WS_EX_TOOLWINDOW);
end;
end.